RE: Tire's pressure ?
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RE: Tire's pressure ? - 2/3/2008 12:16:19 AM
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aldous
Posts: 128
Joined: 1/5/2008
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Hi Texas Jim,
yesterday my mechanic put in place the new spark plugs. The old sparks were OK , the problem was : 2-3 were slightly loose ( those that are more difficult to reach ). Infact I supposed that something was wrong with sparks.
Oh my god , what a difference with new sparks! Above all at low-mid rpm. now my engine runs so smooth...It desn't smoke anymore and I'm sure that the gas consumption will be improved ( good). less noise too. Instead I don't see a great difference at high RPM : but I must probably go for a larger air cleaner ( now mine is 10"), to have more air flow when the carb demands .
before replacing the last spark plug , my mech measured the compression ratio. He had some difficulties in keeping firmly the meter in the spark's hole ( due to high pressure) so we supposed that the actual compression ratio is slightly more than the value measured : we have measured 9:1 . But we think it should be about 9,2:1 . Does this value tell something to you about my engine HP?
power steering . I hear a hissing noise in the play position ( with engine OFF) coming from the control valve. No noise if I go over the play position.
I have checked the gear box watching it through the engine bay( from above) : I see the shafts and levers moving without any play there
Set all the 4 tires at high pressure too
thanks
Aldo
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Aldo from south Italy
1979 L82 ,4 speed, edelbrock performer rpm intake, edelbrock 600cfm carb,double hump 64cc heads 2.02/1.6 valves, Hedman Hedders dual headers, Flowmaster 40 series, Goodyear Eagle GT+4 255/60/15 , 4 Bilstein HD shocks
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RE: Tire's pressure ? - 2/3/2008 9:22:53 AM
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73shark
Posts: 1057
Joined: 4/18/2006
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Curious as to how you can measure compression ratio with a gauge?
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RE: Tire's pressure ? - 2/3/2008 9:37:58 AM
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C3 Starship
Posts: 4696
Joined: 7/25/2006
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quote:
ORIGINAL: 73shark
Curious as to how you can measure compression ratio with a gauge?
Me too....
The compression ratio is the TDC cylinder volume vs the BDC cylinder volume. I can't see how a gauge is goin' to measure that. 
The gauge only measures the psi per cylinder, which gives no indication of the cylinder volume.  If your mech knows something I don't, please fill me in on his method. 
_____________________________
1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response.
400+ hp, 454, M-22, 3.07
http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg
2007 H. D. Sportster, XL 883 EFI
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RE: Tire's pressure ? - 2/3/2008 9:42:31 AM
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73shark
Posts: 1057
Joined: 4/18/2006
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Plus if he's really just measuring compression, then he should have all of the plugs out and carb at WOT.
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So many toys, so little time
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RE: Tire's pressure ? - 2/3/2008 9:53:51 AM
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aldous
Posts: 128
Joined: 1/5/2008
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73 shark,
yes you are right. Also my mech told me that to make a correct measure we should remove all the spark plugs...but no time for this now.
So we have made the measure on 1 cylinder only , with all the spark plugs in place, distributor off , carb at full power ( open ).Running the engine with starter only for about 10 sec until we got the measure
I think that at the end the measure has been substantially correct...
The gauge used is a quite usual tool here ( it seems to me) , but can't tell you more... If I go to the shop soon , I'll take a pic of this gauge
Aldo
_____________________________
Aldo from south Italy
1979 L82 ,4 speed, edelbrock performer rpm intake, edelbrock 600cfm carb,double hump 64cc heads 2.02/1.6 valves, Hedman Hedders dual headers, Flowmaster 40 series, Goodyear Eagle GT+4 255/60/15 , 4 Bilstein HD shocks
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RE: Tire's pressure ? - 2/3/2008 10:03:46 AM
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73shark
Posts: 1057
Joined: 4/18/2006
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That would be nice to see a picture. Can always use a new tool/gauge.
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So many toys, so little time
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RE: Tire's pressure ? - 2/3/2008 11:22:16 AM
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C3 Starship
Posts: 4696
Joined: 7/25/2006
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One method I heard of for measuring the ratio and CID,..... is to fill the cyl with liquid at BDC, turn the engine over by hand to TDC, and measure the differance in the volume of fluid removed to the volume of fluid used to fill the cyl at BDC. This method is generally done with the engine out of the car and on a stand. It can be done while the engine is still in the car though. I've never used this method, but they used to do it at the race track to verify CID, when there was dispute over an engine's displacement. Some classes limited the CID. ( it was done on the compression stroke so that the valves were closed ) This was done with a hose and fitting that would screw into the spark plug hole.
Yes, yes, I know....there is a point where there is a lap over of a valve still remaining patially open during the comp stroke. Especially in a souped up engine. I don't fully understand how they would get an accurate measurement since it seems to me that there would be a fluid loss out the open valve, but that's what they did at the track. Maybe they would measure the fluid remaining in the cyl by sucking it out and measuring it's volume.
_____________________________
1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response.
400+ hp, 454, M-22, 3.07
http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg
2007 H. D. Sportster, XL 883 EFI
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